The XP-57 was proposed by Tucker Aviation Co. as a small, lightweight and highly maneuverable fighter. The engine was to be mounted behind the pilot with the propeller drive shaft running between the pilot's legs, similar to the P-39 design. To reduce weight, the fuselage was designed as a metal tubing framework with aluminum skin and the wings were going to be made of plywood. The aircraft was never built because of financial problems at Tucker Aviation.